I voted no, I think almost everyone who knows many young people will agree. However, the problem is not only kids, the problem is our entire society (myself included). There are nearly no people any more who get enough exercise, or who spend any significant amount of time outdoors (unless you happen not to have a car and have to walk everywhere). People have become contented to stay inside watching the latest episode of Two and a Half Men on television, twittering about how they just had "The best chicken sandwhich EVER!", and playing Angry Birds.
I think that the solution to the problem would be more parents taking their kids to the park from the time they are very young, at least once a week, taking your kids camping on a semi-regular basis (obviously every weekend won't work, but maybe once a month or once every other month or so), and - perhaps - turning off all of the power in your house, except for the kitchen, for the entire day once every few weeks.